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    .box{
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      height: 300px;
      border: solid 1px blue;
      background-image: url(https://by-image.oss-cn-shanghai.aliyuncs.com/yfront/static/home/pic_shejiao_support.png);
      background-size: 100% 100%;
      /* background-size: cover; */
      /* background-size: contain; */
      background-repeat: no-repeat;
      /* background-position: center; */
      background-attachment: fixed;
    }

    .jlt{
      width: 15px;
      height: 15px;
      background-image: url(../Img/jlt.jpg);
      /* background-position:px; */
    }
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